A flat roof must be strong durable and stable throughout its lifetime.
Flat roof insulation thickness building regulations.
The thickness of insulation will depend on the type of insulant.
Depending on where you live in the uk snowfall must also sometimes be considered in determining the gradient of the fall.
Different insulants have different efficiencies and performance levels which affects the thickness required to meet building regulations.
A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less.
If you are replacing more than 25 of the roofing area then you will also need to replace the thermal insulation.
The two variations of flat roof.
This is placed over the roof joists and an board normally external ply is laid on top.
Insulation can also help to limit condensation and contribute to acoustic insulation depending on the type of insulation used.
To determine how much insulation thickness your project requires to meet the above use ecotherm s online u value calculator available 24 7.
Ventilation is required for these roofs.
Summary of flat roof building regulations.
How are flat roofs defined.
For further information contact the building regulations division.
To comply with part l of the building regulations 2010 all roofs to rooms except those in unheated buildings should be thermally insulated to a maximum u value of of 0 18 w m k.
All roofs should be insulated.
If you are upgrading the roof to meet current thermal requirements then the thickness of insulation will vary depending on its thermal conductivity.
U value of a flat roof.
Flat roof types.
It must provide adequate protection against the elements keeping the buildings structure and interior dry.
120mm of kingspan tr26 or similar will make the.
Used within a bauder waterproofing system our products meet current uk building regulations part b for fire protection.
The below drawing shows the u value requirements set out for new properties in the building regulations for each element walls floors and roofs.
Usually flat roof constructions are defined as either cold or warm depending on how the thermal insulation is positioned in the construction.
The actual specification required for a compliant building and necessary building fabric u value targets may vary depending on the actual overall proposed specification and the outcome of the energy assessment.
Insulation between flat roof joists 50mm air gap above decking surrey building control guidance note.
Warm deck the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications.
Start your calculation if you need any assistance or clarification regarding building regulations for your upcoming project get in touch with our technical team.
